I am looking a venturing into doing on-location children's & family photography, and I am looking for some equipment and technique questions.

I currently have a Nikon D3S, 24-70 lens, 85mm lens, flash, and a strobist type softbox with pocketwizards. When I shoot, I will have the benefit of an assistant to hold lighting gear if necessary. I will be shooting in early morning or late afternoon (golden hour) light.

My question for those experienced with this type of photography, would it be best just to shoot with a reflector only while chasing the little ones around or perhaps have the assistant move with me and the subject while holding the portable softbox and keeping roughly the same distance-to-subject where possible?

We are know kids are going to bounce around...I'm curious what successes you all have had and with what techniques.